Incommensurate charge stripe ordering in La2-xSr xNiO4 for x=(0.33,0.30,0.275)

M. E. Ghazi, P. D. Spencer, S. B. Wilkins, P. D. Hatton, D. Mannix, D. Prabhakaran, A. T. Boothroyd, S. W. Cheong

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In this paper we report studies of the charge stripe ordering using high resolution x-ray scattering in the nickelate system La2-xSr xNiO4 with doping levels of x=0.33, x=0.30, and x=0.275. The charge stripes for all doping levels were found to be two dimensional in nature with a high degree of correlation in the a-b plane. The in-plane inverse correlation length in the lower doped systems was greater than that in the x=0.33 system and is greatest for x=0.275, consistent with the stripes becoming less correlated as the doping level is decreased from x=0.33. However, the charge ordering in the x=0.33 system was observed to be more two dimensional in nature with a greater inverse correlation length between planes. The interaction between the lattice and charge order was observed to stabilize the charge ordering, even in the absence of spin ordering. In the x=0.30 and x=0.275 systems no long-range charge order could exist without the presence of the magnetic order. In both systems the charge stripes were incommensurate and on heating the incommensurability increased towards the stable ε=0.33 value as the stripes gained thermal energy to overcome the Coulombic repulsion. In all these systems the integrated intensity of the stripe reflections showed a clear difference in behavior from previous neutron studies with an initial increase in the integrated intensity as the temperature was increased, which was not found in the neutron studies.

Original languageEnglish (US)
Article number144507
Pages (from-to)144507-1-144507-9
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
StatePublished - Oct 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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